Russian traffic is worth nearly zero due to it being nearly 3rd world and full of hackers / scammers and just generally people with no ability to spend money online.

Comparing a sites advertising rates that has a ton of premium traffic to one that's comprised of mostly all Russian traffic is no comparison at all.

Wow, if someone buys one of these keys from you, after looking at all the warnings about you scamming people in your feedback, they wouldn't be a very bright individual...

Any guarantees come with the service?

One thing to note with PayPal is that if you charge back or get charged back a lot, win or lose, they'll suspend your account and hold your funds. Not a good idea to do anything that will result in having to charge back or getting a charge back, if you enjoy the ability to have an account with PayPal and not having your funds held for 6 months.